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Sun H, Zhao L, Mao X, Cao R, Liu Q. Identification of a Key Loop for Tuning Transglycosylation Activity in the Substrate-Binding Region of a Chitosanase. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:5585-5591. [PMID: 37000127 DOI: 10.1021/acs.jafc.3c00110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Csn-PD, a glycoside family 46 chitosanase from Paenibacillus dendritiformis, exhibits endotype hydrolysis of chitosan and produces (GlcN)2 as the major product. Here, we report the crystal structure of Csn-PD at 1.68 Å resolution. The structure contains 14 α-helices and two β-strands that fold into two globular domains with the substrate bound between them. To evaluate the function of a loop in the substrate-binding region (residues 112-116, NDKHP), a mutant Csn-PDL1, in which this loop was deleted, was generated. Hydrolysis of chitosan by the mutant yielded chitooligosaccharides (COSs) with higher degrees of polymerization (DP) than the wild-type enzyme. Excitingly, (GlcN)6 was produced from smaller COSs via transglycosylation activity of the mutant. Hence, the catalytic performance of a chitosanase was altered by modification of a loop in the substrate-binding regions. Our novel data on a chitosanase with transglycosylation activity offer a promising way to produce COSs with high DP.
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Affiliation(s)
- Huihui Sun
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
| | - Ling Zhao
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
| | - Xiangzhao Mao
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Rong Cao
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Qi Liu
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
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2
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Xia C, Li D, Qi M, Wang Y, Zhang Y, Yang Y, Hu Z, Du X, Zhao Y, Yu K, Huang Y, Li Z, Ye X, Cui Z. Preparation of chitooligosaccharides with a low degree of polymerization and anti-microbial properties using the novel chitosanase AqCsn1. Protein Expr Purif 2023; 203:106199. [PMID: 36372201 DOI: 10.1016/j.pep.2022.106199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/05/2022] [Accepted: 11/06/2022] [Indexed: 11/13/2022]
Abstract
Chitosanases hydrolyze chitosan into chitooligosaccharides (COSs) with various biological activities, which are widely employed in many areas including plant disease management. In this study, the novel chitosanase AqCsn1 belonging to the glycoside hydrolase family 46 (GH46) was cloned from Aquabacterium sp. A7-Y and heterologously expressed in Escherichia coli BL21 (DE3). AqCsn1 displayed the highest hydrolytic activity towards chitosan with 95% degree of deacetylation at 40 °C and pH 5.0, with a specific activity of 13.18 U/mg. Product analysis showed that AqCsn1 hydrolyzed chitosan into (GlcN)2 and (GlcN)3 as the main products, demonstrating an endo-type cleavage pattern. Evaluation of antagonistic activity showed that the hydrolysis products of AqCsn1 suppress the mycelial growth of Magnaporthe oryzae and Phytophthora sojae in a concentration-dependent manner, and the inhibition rate of P. sojae reached 39.82% at a concentration of 8 g/L. Our study demonstrates that AqCsn1 and hydrolysis products with a low degree of polymerization might have potential applications in the biological control of agricultural diseases.
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Affiliation(s)
- Chengyao Xia
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Ding Li
- Institute of Veterinary Immunology & Engineering, Jiangsu Academy of Agricultural Sciences, 210014, Nanjing, PR China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China; Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing, 210014, China
| | - Mengyi Qi
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yanxin Wang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yue Zhang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yiheng Yang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Zejia Hu
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xin Du
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yuqiang Zhao
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China
| | - Kuai Yu
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yan Huang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Zhoukun Li
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Xianfeng Ye
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China.
| | - Zhongli Cui
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China.
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3
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Wang Y, Li D, Liu M, Xia C, Fan Q, Li X, Lan Z, Shi G, Dong W, Li Z, Cui Z. Preparation of Active Chitooligosaccharides with a Novel Chitosanase AqCoA and Their Application in Fungal Disease Protection. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:3351-3361. [PMID: 33688732 DOI: 10.1021/acs.jafc.0c07802] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Enzymes that degrade fungal cell walls and the resulting oligosaccharides are promising weapons to combat plant fungal disease. In this study, we identified a novel endo-chitosanase, AqCoA, from Aquabacterium sp. A7-Y. The enzyme showed a specific activity of 18 U/mg toward 95% deacetylated chitosan at pH 5.0 and 40 °C. AqCoA also showed activity toward sodium carboxymethylcellulose, indicating substrate promiscuity. AqCoA hydrolyzed chitosan into chitooligosaccharides (CoA-COSs) with degrees of polymerization (DPs) of 3-5 but showed no activity toward CoA-COSs with DPs <6, indicating an endo-type activity. At 2.5 μg/mL, AqCoA inhibited appressorium formation of Magnaporthe oryzae; the produced CoA-COSs also inhibited the growth of M. oryzae and Fusarium oxysporum. Furthermore, CoA-COSs acted as immune elicitors in rice by inducing the reactive oxygen species burst and the expression of defense genes. These results demonstrated that AqCoA and its resulting CoA-COSs might be effective tools for protecting plants against pathogenic fungi.
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Affiliation(s)
- Yanxin Wang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Ding Li
- Institute of Veterinary Immunology & Engineering, Jiangsu Academy of Agricultural Sciences, 210014 Nanjing, P. R. China
| | - Muxing Liu
- The Key Laboratory of Monitoring and Management of Plant Diseases and Insects of Chinese Ministry of Agriculture, College of Plant Protection, Nanjing Agriculture University, 210095 Nanjing, P. R. China
| | - Chengyao Xia
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Qiwen Fan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Xu Li
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Zejun Lan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Guolong Shi
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Weiliang Dong
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 211800 Nanjing, P. R. China
| | - Zhoukun Li
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
| | - Zhongli Cui
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences of Nanjing Agricultural University, 210095 Nanjing, P. R. China
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Li Y, Gou Y, Liu Z, Xie T, Wang G. Structure-based rational design of chitosanase CsnMY002 for high yields of chitobiose. Colloids Surf B Biointerfaces 2021; 202:111692. [PMID: 33744813 DOI: 10.1016/j.colsurfb.2021.111692] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 03/07/2021] [Accepted: 03/09/2021] [Indexed: 10/21/2022]
Abstract
Chitosan oligosaccharides (COS) are attractive active molecules for biomedical applications. Currently, the prohibitively high cost of producing fully defined COS hampers extensive studies on their biological activity and restricts their use in various industries. Thus, cost-effective production of pure COS is of major importance. In this report, chitosanase from Bacillus subtilis MY002 (CsnMY002) was prepared for COS production. The structure of apo CsnMY002 displayed an unexpected tunnel-like substrate-binding site and the structure of the CsnMY002_E19A/(GlcN)6 complex highlighted the "4 + 2″ splitting of hexaglucosamine even though the "3 + 3″ splitting is also observed in the TLC analysis of the enzyme products for hexaglucosamine. Structure based rational design was performed to generate mutants for chitobiose production. The CsnMY002_G21 K mutant produced chitobiose with a relative content > 87 % from chitosan with a low degree of acetylation, and 50.65 mg chitobiose with a purity > 98 % was prepared from 100 mg chitosan. The results provide insight on the catalytic mechanism of chitosanase and underpin future biomedical applications of pure chitobiose.
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Affiliation(s)
- Yubin Li
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Environmental Microbiology of Sichuan Province, Chengdu, 610041, China; College of Life Sciences, Sichuan University, Chengdu, 610064, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yan Gou
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Environmental Microbiology of Sichuan Province, Chengdu, 610041, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhongchuan Liu
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Environmental Microbiology of Sichuan Province, Chengdu, 610041, China
| | - Tian Xie
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Environmental Microbiology of Sichuan Province, Chengdu, 610041, China
| | - Ganggang Wang
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Key Laboratory of Environmental Microbiology of Sichuan Province, Chengdu, 610041, China; The Innovative Academy of Seed Design (INASEED), Chinese Academy of Sciences, Beijing, 100101, China.
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5
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Pilot-Scale Production of Chito-Oligosaccharides Using an Innovative Recombinant Chitosanase Preparation Approach. Polymers (Basel) 2021; 13:polym13020290. [PMID: 33477553 PMCID: PMC7831125 DOI: 10.3390/polym13020290] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 12/03/2022] Open
Abstract
For pilot-scale production of chito-oligosaccharides, it must be cost-effective to prepare designable recombinant chitosanase. Herein, an efficient method for preparing recombinant Bacillus chitosanase from Escherichia coli by elimination of undesirable substances as a precipitate is proposed. After an optimized culture with IPTG (Isopropyl β-d-1-thiogalactopyranoside) induction, the harvested cells were resuspended, disrupted by sonication, divided by selective precipitation, and stored using the same solution conditions. Several factors involved in these procedures, including ion types, ionic concentration, pH, and bacterial cell density, were examined. The optimal conditions were inferred to be pH = 4.5, 300 mM sodium dihydrogen phosphate, and cell density below 1011 cells/mL. Finally, recombinant chitosanase was purified to >70% homogeneity with an activity recovery and enzyme yield of 90% and 106 mg/L, respectively. When 10 L of 5% chitosan was hydrolyzed with 2500 units of chitosanase at ambient temperature for 72 h, hydrolyzed products having molar masses of 833 ± 222 g/mol with multiple degrees of polymerization (chito-dimer to tetramer) were obtained. This work provided an economical and eco-friendly preparation of recombinant chitosanase to scale up the hydrolysis of chitosan towards tailored oligosaccharides in the near future.
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Yang G, Sun H, Cao R, Liu Q, Mao X. Characterization of a novel glycoside hydrolase family 46 chitosanase, Csn-BAC, from Bacillus sp. MD-5. Int J Biol Macromol 2020; 146:518-523. [PMID: 31917207 DOI: 10.1016/j.ijbiomac.2020.01.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 01/03/2020] [Accepted: 01/04/2020] [Indexed: 10/25/2022]
Abstract
Chitosanases play an important role in chitosan degradation, and the enzymatic degradation products of chitosan show various biological activities. Here, a novel glycoside hydrolase family 46 chitosanase (named Csn-BAC) from Bacillus sp. MD-5 was heterologously expressed in Escherichia coli BL21 (DE3). The recombinant enzyme was purified by Ni-NTA affinity chromatography, and its molecular weight was estimated to be 35 kDa by SDS-PAGE. Csn-BAC showed maximal activity toward colloidal chitosan at pH 7 and 40 °C. The enzymatic activity of Csn-BAC was enhanced by Mn2+, Cu2+ and Co2+ at 1 mM, and by Mn2+ at 5 mM. Thin-layer chromatography and electrospray ionization-mass spectrometry results demonstrated that Csn-BAC exhibited an endo-type cleavage pattern and hydrolyzed chitosan to yield, mainly, (GlcN)2 and (GlcN)3. The enzymatic properties of this chitosanase may make it a good candidate for use in oligosaccharide production-based industries.
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Affiliation(s)
- Guosong Yang
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China
| | - Huihui Sun
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
| | - Rong Cao
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China; Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
| | - Qi Liu
- Department of Food Engineering and Nutrition, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
| | - Xiangzhao Mao
- College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China; Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
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Nakamichi Y, Fouquet T, Ito S, Watanabe M, Matsushika A, Inoue H. Structural and functional characterization of a bifunctional GH30-7 xylanase B from the filamentous fungus Talaromyces cellulolyticus. J Biol Chem 2019; 294:4065-4078. [PMID: 30655295 DOI: 10.1074/jbc.ra118.007207] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 01/15/2019] [Indexed: 01/11/2023] Open
Abstract
Glucuronoxylanases are endo-xylanases and members of the glycoside hydrolase family 30 subfamilies 7 (GH30-7) and 8 (GH30-8). Unlike for the well-studied GH30-8 enzymes, the structural and functional characteristics of GH30-7 enzymes remain poorly understood. Here, we report the catalytic properties and three-dimensional structure of GH30-7 xylanase B (Xyn30B) identified from the cellulolytic fungus Talaromyces cellulolyticus Xyn30B efficiently degraded glucuronoxylan to acidic xylooligosaccharides (XOSs), including an α-1,2-linked 4-O-methyl-d-glucuronosyl substituent (MeGlcA). Rapid analysis with negative-mode electrospray-ionization multistage MS (ESI(-)-MS n ) revealed that the structures of the acidic XOS products are the same as those of the hydrolysates (MeGlcA2Xyl n , n > 2) obtained with typical glucuronoxylanases. Acidic XOS products were further degraded by Xyn30B, releasing first xylobiose and then xylotetraose and xylohexaose as transglycosylation products. This hydrolase reaction was unique to Xyn30B, and the substrate was cleaved at the xylobiose unit from its nonreducing end, indicating that Xyn30B is a bifunctional enzyme possessing both endo-glucuronoxylanase and exo-xylobiohydrolase activities. The crystal structure of Xyn30B was determined as the first structure of a GH30-7 xylanase at 2.25 Å resolution, revealing that Xyn30B is composed of a pseudo-(α/β)8-catalytic domain, lacking an α6 helix, and a small β-rich domain. This structure and site-directed mutagenesis clarified that Arg46, conserved in GH30-7 glucuronoxylanases, is a critical residue for MeGlcA appendage-dependent xylan degradation. The structural comparison between Xyn30B and the GH30-8 enzymes suggests that Asn93 in the β2-α2 loop is involved in xylobiohydrolase activity. In summary, our findings indicate that Xyn30B is a bifunctional endo- and exo-xylanase.
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Affiliation(s)
| | - Thierry Fouquet
- the Polymer Chemistry Group, Research Institute for Sustainable Chemistry, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan, and
| | - Shotaro Ito
- the Bio-based Materials Chemistry Group, Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 3-11-32 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | | | - Akinori Matsushika
- From the Bioconversion Group and.,the Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan
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8
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Sun H, Mao X, Guo N, Zhao L, Cao R, Liu Q. Discovery and Characterization of a Novel Chitosanase from Paenibacillus dendritiformis by Phylogeny-Based Enzymatic Product Specificity Prediction. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:4645-4651. [PMID: 29687713 DOI: 10.1021/acs.jafc.7b06067] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In the process of genome mining for novel chitosanases by phylogeny-based enzymatic product specificity prediction, a gene named Csn-PD from Paenibacillus dendritiformis was discovered. The enzyme was classified as a member of the GH46 family of glycoside hydrolase based on sequence alignment, and it was functionally expressed in Escherichia coli BL21 (DE3). The recombinant chitosanase was purified, and its molecular weight was estimated to be 31 kDa by SDS-PAGE. Csn-PD displayed maximal activity toward colloidal chitosan at pH 7.0 and 45 °C, respectively. A combination of thin-layer chromatography and electrospray ionization-mass spectrometry results showed that Csn-PD exhibited an endotype cleavage pattern and hydrolyzed chitosan to yield (GlcN)2 as the major product. The unique enzymatic properties of this chitosanase may make it a good candidate for (GlcN)2 production.
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Affiliation(s)
- Huihui Sun
- Department of Food Engineering and Nutrition , Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences , Qingdao 266071 , China
| | - Xiangzhao Mao
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Na Guo
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Ling Zhao
- Department of Food Engineering and Nutrition , Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences , Qingdao 266071 , China
| | - Rong Cao
- Department of Food Engineering and Nutrition , Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences , Qingdao 266071 , China
| | - Qi Liu
- Department of Food Engineering and Nutrition , Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences , Qingdao 266071 , China
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9
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Regel EK, Weikert T, Niehues A, Moerschbacher BM, Singh R. Protein-engineering of chitosanase from Bacillus sp. MN to alter its substrate specificity. Biotechnol Bioeng 2018; 115:863-873. [PMID: 29280476 DOI: 10.1002/bit.26533] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 11/30/2017] [Accepted: 12/18/2017] [Indexed: 01/29/2023]
Abstract
Partially acetylated chitosan oligosaccharides (paCOS) have various potential applications in agriculture, biomedicine, and pharmaceutics due to their suitable bioactivities. One method to produce paCOS is partial chemical hydrolysis of chitosan polymers, but that leads to poorly defined mixtures of oligosaccharides. However, the effective production of defined paCOS is crucial for fundamental research and for developing applications. A more promising approach is enzymatic depolymerization of chitosan using chitinases or chitosanases, as the substrate specificity of the enzyme determines the composition of the oligomeric products. Protein-engineering of these enzymes to alter their substrate specificity can overcome the limitations associated with naturally occurring enzymes and expand the spectrum of specific paCOS that can be produced. Here, engineering the substrate specificity of Bacillus sp. MN chitosanase is described for the first time. Two muteins with active site substitutions can accept N-acetyl-D-glucosamine units at their subsite (-2), which is impossible for the wildtype enzyme.
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Affiliation(s)
- Eva K Regel
- Institute for Biology and Biotechnology of Plants, University of Münster, Münster, Germany
| | - Tobias Weikert
- Institute for Biology and Biotechnology of Plants, University of Münster, Münster, Germany
| | - Anna Niehues
- Institute for Biology and Biotechnology of Plants, University of Münster, Münster, Germany
| | - Bruno M Moerschbacher
- Institute for Biology and Biotechnology of Plants, University of Münster, Münster, Germany
| | - Ratna Singh
- Institute for Biology and Biotechnology of Plants, University of Münster, Münster, Germany
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Identification and first insights into the structure and biosynthesis of chitin from the freshwater sponge Spongilla lacustris. J Struct Biol 2013; 183:474-483. [DOI: 10.1016/j.jsb.2013.06.015] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 06/24/2013] [Accepted: 06/27/2013] [Indexed: 11/24/2022]
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11
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Gupta V, Prasanna R, Srivastava AK, Sharma J. Purification and characterization of a novel antifungal endo-type chitosanase from Anabaena fertilissima. ANN MICROBIOL 2011. [DOI: 10.1007/s13213-011-0350-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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12
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Dubeau MP, Guay I, Brzezinski R. Modification of genetic regulation of a heterologous chitosanase gene in Streptomyces lividans TK24 leads to chitosanase production in the absence of chitosan. Microb Cell Fact 2011; 2:226-9. [PMID: 21310076 PMCID: PMC3048496 DOI: 10.1186/1475-2859-10-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Accepted: 02/10/2011] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Chitosanases are enzymes hydrolysing chitosan, a β-1,4 linked D-glucosamine bio-polymer. Chitosan oligosaccharides have numerous emerging applications and chitosanases can be used for industrial enzymatic hydrolysis of chitosan. These extracellular enzymes, produced by many organisms including fungi and bacteria, are well studied at the biochemical and enzymatic level but very few works were dedicated to the regulation of their gene expression. This is the first study on the genetic regulation of a heterologous chitosanase gene (csnN106) in Streptomyces lividans. RESULTS Two S. lividans strains were used for induction experiments: the wild type strain and its mutant (ΔcsnR), harbouring an in-frame deletion of the csnR gene, encoding a negative transcriptional regulator. Comparison of chitosanase levels in various media indicated that CsnR regulates negatively the expression of the heterologous chitosanase gene csnN106. Using the ΔcsnR host and a mutated csnN106 gene with a modified transcription operator, substantial levels of chitosanase could be produced in the absence of chitosan, using inexpensive medium components. Furthermore, chitosanase production was of higher quality as lower levels of extracellular protease and protein contaminants were observed. CONCLUSIONS This new chitosanase production system is of interest for biotechnology as only common media components are used and enzyme of high degree of purity is obtained directly in the culture supernatant.
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Affiliation(s)
- Marie-Pierre Dubeau
- Centre d'Étude et de Valorisation de la Diversité Microbienne, Département de Biologie, Faculté des Sciences, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, J1K 2R1, (Québec) Canada
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13
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Kumirska J, Czerwicka M, Kaczyński Z, Bychowska A, Brzozowski K, Thöming J, Stepnowski P. Application of spectroscopic methods for structural analysis of chitin and chitosan. Mar Drugs 2010; 8:1567-636. [PMID: 20559489 PMCID: PMC2885081 DOI: 10.3390/md8051567] [Citation(s) in RCA: 525] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Revised: 03/30/2010] [Accepted: 04/27/2010] [Indexed: 12/22/2022] Open
Abstract
Chitin, the second most important natural polymer in the world, and its N-deacetylated derivative chitosan, have been identified as versatile biopolymers for a broad range of applications in medicine, agriculture and the food industry. Two of the main reasons for this are firstly the unique chemical, physicochemical and biological properties of chitin and chitosan, and secondly the unlimited supply of raw materials for their production. These polymers exhibit widely differing physicochemical properties depending on the chitin source and the conditions of chitosan production. The presence of reactive functional groups as well as the polysaccharide nature of these biopolymers enables them to undergo diverse chemical modifications. A complete chemical and physicochemical characterization of chitin, chitosan and their derivatives is not possible without using spectroscopic techniques. This review focuses on the application of spectroscopic methods for the structural analysis of these compounds.
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Affiliation(s)
- Jolanta Kumirska
- Faculty of Chemistry, University of Gdansk, Sobieskiego 18/19, PL-80-952 Gdansk, Poland; E-Mails:
(M.C.);
(Z.K.);
(A.B.);
(K.B.);
(P.S.)
| | - Małgorzata Czerwicka
- Faculty of Chemistry, University of Gdansk, Sobieskiego 18/19, PL-80-952 Gdansk, Poland; E-Mails:
(M.C.);
(Z.K.);
(A.B.);
(K.B.);
(P.S.)
| | - Zbigniew Kaczyński
- Faculty of Chemistry, University of Gdansk, Sobieskiego 18/19, PL-80-952 Gdansk, Poland; E-Mails:
(M.C.);
(Z.K.);
(A.B.);
(K.B.);
(P.S.)
| | - Anna Bychowska
- Faculty of Chemistry, University of Gdansk, Sobieskiego 18/19, PL-80-952 Gdansk, Poland; E-Mails:
(M.C.);
(Z.K.);
(A.B.);
(K.B.);
(P.S.)
| | - Krzysztof Brzozowski
- Faculty of Chemistry, University of Gdansk, Sobieskiego 18/19, PL-80-952 Gdansk, Poland; E-Mails:
(M.C.);
(Z.K.);
(A.B.);
(K.B.);
(P.S.)
| | - Jorg Thöming
- UFT-Centre for Environmental Research and Sustainable Technology, University of Bremen, Leobener Straße UFT, D-28359 Bremen, Germany; E-Mail:
(J.T.)
| | - Piotr Stepnowski
- Faculty of Chemistry, University of Gdansk, Sobieskiego 18/19, PL-80-952 Gdansk, Poland; E-Mails:
(M.C.);
(Z.K.);
(A.B.);
(K.B.);
(P.S.)
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Ochiai A, Itoh T, Mikami B, Hashimoto W, Murata K. Structural determinants responsible for substrate recognition and mode of action in family 11 polysaccharide lyases. J Biol Chem 2009; 284:10181-9. [PMID: 19193638 PMCID: PMC2665072 DOI: 10.1074/jbc.m807799200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Revised: 12/29/2008] [Indexed: 11/06/2022] Open
Abstract
A saprophytic Bacillus subtilis secretes two types of rhamnogalacturonan (RG) lyases, endotype YesW and exotype YesX, which are responsible for an initial cleavage of the RG type I (RG-I) region of plant cell wall pectin. Polysaccharide lyase family 11 YesW and YesX with a significant sequence identity (67.8%) cleave glycoside bonds between rhamnose and galacturonic acid residues in RG-I through a beta-elimination reaction. Here we show the structural determinants for substrate recognition and the mode of action in polysaccharide lyase family 11 lyases. The crystal structures of YesW in complex with rhamnose and ligand-free YesX were determined at 1.32 and 1.65 A resolution, respectively. The YesW amino acid residues such as Asn(152), Asp(172), Asn(532), Gly(533), Thr(534), and Tyr(595) in the active cleft bind to rhamnose molecules through hydrogen bonds and van der Waals contacts. Other rhamnose molecules are accommodated at the noncatalytic domain far from the active cleft, revealing that the domain possibly functions as a novel carbohydrate-binding module. A structural comparison between YesW and YesX indicates that a specific loop in YesX for recognizing the terminal saccharide molecule sterically inhibits penetration of the polymer over the active cleft. The loop-deficient YesX mutant exhibits YesW-like endotype activity, demonstrating that molecular conversion regarding the mode of action is achieved by the addition/removal of the loop for recognizing the terminal saccharide. This is the first report on a structural insight into RG-I recognition and molecular conversion of exotype to endotype in polysaccharide lyases.
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